U.S. Route 166
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U.S. Highway 166 is an east-west United States highway. This route and US 266 are the only two remaining children of historic U.S. Highway 66, since US 666 was decommissioned in 2003.
US 166 meets the old route of US 66, now designated Alt US 69, in Baxter Springs in the southeast corner of Kansas.
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Termini
As of 2004, the highway's eastern terminus is southwest of Joplin, Missouri at an intersection with Interstate 44 one mile (1.6 km) from the Kansas border, about 1000 feet (300 meters) from the point where Kansas, Missouri, and Oklahoma meet. U.S. Route 400 also ends here, and the routes are co-signed for their last 10 miles (16 km), from Baxter Springs, Kansas.
Its western terminus is in South Haven, Kansas at an intersection with U.S. Highway 81, near the northern terminus of U.S. Highway 177.
Historic termini
US 166 from Baxter Springs, Kansas to South Haven was an original 1926 route. In 1945, the east end of the route was extended through Joplin, Missouri, where it paralleled U.S. Highway 66 to Springfield, Missouri. But when the last section of Interstate 44 was completed between Joplin and Springfield in 1966, the east end of US 166 was truncated from Springfield back to the I-44 intersection west of Joplin. The old sections of US 166 between Joplin and Springfield not upgraded to interstate standards were either downgraded from state to local/county jurisdiction, renumbered as I-44 business loops or renumbered as state highways.
States traversed
The highway passes through the following states:
Business U.S. Highway 166
- Sedan, Kansas
- Springfield, Missouri Decommissoned
Related US Routes
- U.S. Highway 66
- U.S. Highway 266
- U.S. Highway 366
- U.S. Highway 466
- U.S. Highway 566
- U.S. Highway 666